Operation - Makita GA7020R Instruction Manual

For tool with locking screw type
wheel guard
► Fig.7: 1. Wheel guard 2. Screw 3. Bearing box
Mount the wheel guard with the protrusion on the wheel guard
band aligned with the notch on the bearing box. Then rotate
the wheel guard to such an angle that it can protect the opera-
tor according to work. Be sure to tighten the screw securely.
To remove wheel guard, follow the installation proce-
dure in reverse.
For tool with clamp lever type wheel guard
► Fig.8: 1. Wheel guard 2. Bearing box 3. Nut
4. Lever
► Fig.9: 1. Nut 2. Lever
Loosen the lever on the wheel guard. Mount the wheel
guard with the protrusion on the wheel guard band aligned
with the notch on the bearing box. Then rotate the wheel
guard around to the position shown in the figure. Tighten
the lever to fasten the wheel guard. If the lever is too tight
or too loose to fasten the wheel guard, loosen or tighten the
nut to adjust the tightening of the wheel guard band.
To remove wheel guard, follow the installation procedure in reverse.
Installing or removing depressed
center grinding wheel/Multi-disc
(accessory)
WARNING:
• Always use supplied guard when depressed
center grinding wheel/Multi-disc is on tool.
Wheel can shatter during use and guard helps
to reduce chances of personal injury.
► Fig.10: 1. Lock nut 2. Depressed center wheel
3. Super flange 4. Inner flange
Mount the inner flange onto the spindle. Fit the wheel/disc on
the inner flange and screw the lock nut onto the spindle.
Super flange
Models with the letter F are standard-equipped with a
super flange. Only 1/3 of efforts needed to undo lock
nut, compared with conventional type.
For Australia and New Zealand
► Fig.11: 1. Lock nut 2. Depressed center wheel
3. Inner flange
Mount the inner flange onto the spindle. Fit the wheel/
disc on the inner flange and screw the lock nut with its
protrusion facing downward (facing toward the wheel).
► Fig.12: 1. Lock nut wrench 2. Shaft lock
To tighten the lock nut, press the shaft lock firmly so
that the spindle cannot revolve, then use the lock nut
wrench and securely tighten clockwise.
To remove the wheel, follow the installation procedure in reverse.
Installing or removing abrasive disc
(optional accessory)
NOTE:
• Use sander accessories specified in this man-
ual. These must be purchased separately.
► Fig.13: 1. Lock nut 2. Abrasive disc 3. Rubber pad
Mount the rubber pad onto the spindle. Fit the disc on
the rubber pad and screw the lock nut onto the spindle.
To tighten the lock nut, press the shaft lock firmly so
that the spindle cannot revolve, then use the lock nut
wrench and securely tighten clockwise.
To remove the disc, follow the installation procedure in
reverse.

OPERATION

WARNING:
• It should never be necessary to force the tool.
The weight of the tool applies adequate pres-
sure. Forcing and excessive pressure could
cause dangerous wheel breakage.
• ALWAYS replace wheel if tool is dropped while grinding.
• NEVER bang or hit grinding disc or wheel onto work.
• Avoid bouncing and snagging the wheel, espe-
cially when working corners, sharp edges etc.
This can cause loss of control and kickback.
• NEVER use tool with wood cutting blades and
other sawblades. Such blades when used on a
grinder frequently kick and cause loss of control
leading to personal injury.
CAUTION:
• Never switch on the tool when it is in contact
with the workpiece, it may cause an injury to
operator.
• Always wear safety goggles or a face shield
during operation.
• After operation, always switch off the tool and
wait until the wheel has come to a complete stop
before putting the tool down.
Grinding and sanding operation
► Fig.14
ALWAYS hold the tool firmly with one hand on rear
handle and the other on the side handle. Turn the tool
on and then apply the wheel or disc to the workpiece.
In general, keep the edge of the wheel or disc at an
angle of about 15 degrees to the workpiece surface.
During the break-in period with a new wheel, do not work
the grinder in the B direction or it will cut into the work-
piece. Once the edge of the wheel has been rounded off by
use, the wheel may be worked in both A and B direction.
Operation with wire cup brush
(optional accessory)
CAUTION:
• Check operation of brush by running tool with no
load, insuring that no one is in front of or in line
with brush.
• Do not use brush that is damaged, or which is
out of balance. Use of damaged brush could
increase potential for injury from contact with
broken brush wires.
9 ENGLISH